96 lines
2.8 KiB
Go
96 lines
2.8 KiB
Go
// Package shelly provides HTTP communication shared by Shelly product implementations.
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package shelly
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import (
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"context"
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"crypto/tls"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"time"
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)
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const maxErrorBodySize = 4 * 1024
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// StatusClient is consumed by product collectors and can be replaced in tests.
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type StatusClient interface {
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GetStatus(context.Context, any) error
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}
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// Client fetches status data from one Shelly device.
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type Client struct {
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baseURL *url.URL
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username string
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password string
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httpClient *http.Client
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}
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// NewClient creates a client that uses HTTP Basic Authentication when credentials are set.
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func NewClient(rawURL, username, password string, timeout time.Duration) (*Client, error) {
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baseURL, err := url.Parse(rawURL)
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if err != nil {
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return nil, fmt.Errorf("parse Shelly URL: %w", err)
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}
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return &Client{
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baseURL: baseURL,
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username: username,
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password: password,
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httpClient: &http.Client{
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Timeout: timeout,
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Transport: insecureTLSTransport(),
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},
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}, nil
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}
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// insecureTLSTransport retains the standard HTTP transport behavior but accepts
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// certificates that are expired, self-signed, or issued for another hostname.
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func insecureTLSTransport() *http.Transport {
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transport := http.DefaultTransport.(*http.Transport).Clone()
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transport.TLSClientConfig = &tls.Config{
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InsecureSkipVerify: true, // #nosec G402 -- Shelly device certificates are intentionally not verified.
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}
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return transport
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}
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// GetStatus decodes the /status response into destination.
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func (c *Client) GetStatus(ctx context.Context, destination any) error {
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statusURL := *c.baseURL
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statusURL.Path = strings.TrimRight(statusURL.Path, "/") + "/status"
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statusURL.RawQuery = ""
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statusURL.Fragment = ""
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request, err := http.NewRequestWithContext(ctx, http.MethodGet, statusURL.String(), nil)
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if err != nil {
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return fmt.Errorf("create status request: %w", err)
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}
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request.Header.Set("Accept", "application/json")
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request.Header.Set("User-Agent", "shelly-exporter")
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if c.username != "" || c.password != "" {
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request.SetBasicAuth(c.username, c.password)
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}
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response, err := c.httpClient.Do(request)
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if err != nil {
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return fmt.Errorf("request %s: %w", statusURL.String(), err)
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}
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defer response.Body.Close()
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if response.StatusCode < http.StatusOK || response.StatusCode >= http.StatusMultipleChoices {
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body, _ := io.ReadAll(io.LimitReader(response.Body, maxErrorBodySize))
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message := strings.TrimSpace(string(body))
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if message == "" {
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return fmt.Errorf("request %s returned %s", statusURL.String(), response.Status)
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}
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return fmt.Errorf("request %s returned %s: %s", statusURL.String(), response.Status, message)
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}
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if err := json.NewDecoder(response.Body).Decode(destination); err != nil {
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return fmt.Errorf("decode response from %s: %w", statusURL.String(), err)
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}
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return nil
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}
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